Hi experts I encountered an error when I sent a request to upload an image， error:map[code:100 fbtrace_id:Anl1AE-yMVtzsJlSwvxi6vP message:(#100) The parameter messaging_product is required. type:OAuthException

I refer to the examples provided in the official documentation， curl -X POST 'https://graph.facebook.com/v21.0/<PHONE_NUMBER_ID>/media' \ -H 'Authorization: Bearer <ACCESS_TOKEN>' \ -F 'file=@"2jC60Vdjn/cross-trainers-summer-sale.jpg"' \ -F 'type="image/jpeg"' \ -F 'messaging_product="whatsapp"'

My main code is shown as below,

body := &bytes.Buffer{} form := multipart.NewWriter(body) part, err := form.CreateFormFile("file", filepath.Base(imagePath)) _, err = io.Copy(part, file) err = form.WriteField("type", res.Header.Get("Content-Type")) err = form.WriteField("messaging_product", "whatsapp") err = form.Close()

req, err := http.NewRequest(http.MethodPost, uploadUrl, body) req.Header.Set("Content-Type", res.Header.Get("Content-Type")) req.Header.Set("messaging_product", "whatsapp") req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", accessToken))

client := &http.Client{Transport: tr} resp, err := client.Do(req)

Thanks for your attention and help.